The Past ten years were bad for the world economy
McKinsey forecasts two scenarios better than the 30 year world growth average and two below
Overall the demographics will be poor for economic growth
However, Offsetting the aging population is the fact that urbanization will continue to increase.
High-tech innovations in robotics and 3-D printing could enable mature and emerging economies alike to boost labor productivity and rapidly expand industrial horizons, while also shifting global trade patterns.
So at least some level of automation will be needed to offset the aging workforce.
Best case - By 2025, the global economy will have grown to $90 trillion in constant 2015 dollars, from $62 trillion in 2015. [3.7% average global growth]
Pretty good but bumpy - Global growth reaches 3.2 percent a year over the course of the decade, a relatively high historical level, and by 2025 the global economy reaches $88 trillion in 2015 dollars.
New slower normal - the global economy reaches $86 trillion in 2015 dollars.
Slow with Rolling regional crises - World economy is 78.6 trillion in 2015 dollars.